Propeller-blades.



L. TRXLER.

PROPELLER BLADES.

APPLIGATION HLBD 0913.21, 1911.

Patented May 19, 1914.

LEON TROXLER, F NEW' ORLEANS, LOUISIANA.

PROPELLER-BLADES.

Specification of Letters Patent.

Patented May 19, 1914.

Application filedv October 21, 1911. Serial No. 656,071.

To all 'whom 'it may concern y Be it known that I, LEON TiioXLER, a citizen of the United States, residing at the city of New Orleans, in the parish of Orleans and State of Louisiana, have invented cer-V tain new and useful Improvementsin I ropeller-Blades, of which the following is a specification.

This invention relates to blades fork propellers for air, water' or other 'fluids orfor fans or'like purposes where adaptable.

One object of my invention is to provide propellers for air-ships, boats, or other d e, vices embodying, among other characteris,

tics, features whereb-y when it is rotated, the inner portion of the blade forces .the air, or other fluids, in any outwardly direction, and the outwardportion forces'the air, or other fluid, inwardly at Vany desired angle.

Another object of my invention is to provide propeller blades in which the pitch of the blades at thev outer portions is less than vthat of the inner portion.

Another object of my invention is to pro- -vide propeller blades of suoli construction that they draw air, or other fluid, from a much larger area than the diameter of tation of 4the propellerJ and compress. this air or other fluid between the rotating inner portion of the blade and the outer rotating portion ofthe bla-de.

With the above and other objects in view, the invention consists in the construction -and novel combination of parts, hereinafter more fully described, illustrated in the accompanying drawings, and point-ed out in the appended claims, it being understood that various changes in the form, proportion, number o'f blades, size and minor details of construction and materials, may be resorted to without departing from the spirit or sacrificing any-of the advantages of the invention.

In the drawings :-Figurel is a face view of a propeller embodying my improvements. Fig. 2 is a sectional View on the line a-a of F l. Fig. 3 is a sectional view on the line b?) of Fig. l. F ig. fl isa sectional view on the -liiie c-o of Fig. 1. Fig. 5 is a transverse sectional view through the hub of the propeller. Fig. 6 is an end View of the propeller. Fig; 7 isa top plan View.

Referring now more particularlyy to the accompanying drawings, the propeller ernbodies a hub' 10, from each side of Which extend one or more feathering blades 12-12,

" each formed alike but disposed in opposite directions, when more thanone blade is employed. v e

. The hub formed at the central portion may be integral with the propeller blades, as shown, or may be aseparate. piece to which the blades are attached,` which is especially desirable when three orfmore are employed,l In this hub l0 I have formed the opening 19 of a suitable shape to mount upon the operating shaft 17 and I have provided thetlireaded screw hole 18 for a set screw. (not shown) to secure the hub in operable position o-n the shaft 17. Extending outwardly from this central hub, are two or more blades adapted, as hereinafter explained, to press against the air or other fluids when rotated.

The forward or outer, side of each blade is slightly conveXed in a transverse direction throughout 'the entire length, the object and purpose thereof being to provide thickness for strength at its middle portion, 'and by gra dually reducing the thickness toward the cutting edges to thereby reduce the resistance in rotating in the air or other fluids.

0n the rear or inner side, the blades are formed with a suitable pitch to press against the air or other fluids as they are rotated. And to better accomplish this-purpose. I have formed each blade with a cutting edge starting from a point almost opposite the middle opening 19 and extending outward in a. plane at an angle in front of the plane of the front surface of the hub and eX- treinities of the blades for about two-thirds the length of the blade say for instance,- to the point 12 and from this point the blade is rapidly curved rearwardpuntil the tip` 16 is in practically the samegplane as' the rear surface of the hub.- The rear or inner surface of each blade ispreferably slightly 'convexed transversely adjacent the hub, as shown in Fig. 2. This convexed portion on the rear or inner surface of each blade adjacent the hub gradually merges into a substantially flat surface, as shown in Fig. 3, from which `the inner surface merges into a concaved inner surface at the outer end of the blade, as shown in Fig. 4.

The inner two-thirds of the reai' surface extending from the hub l0 to the point 12 is disposed at such an angle to the plane of rotation as to give'l to the propeller blade ploved. From about the nninf 10. fhanfpi.

' inner or pushing surface of the blades push against the air or other iiuid as they rotate, thereby creating a forward pressure on the object sustaining said propeller and a, rearward motion of the air or other Huid. It will also be seen, that because of the plane at which the inner two-thirds of each rear sur? face is disposed with relation to the plane of rotation it forces the air or other fluid in which the blades are rotated in an outward direction at an angle to such surfaces. It will also be seen that the outer one-third, by reason of its inward curve, will draw air or other 'fluid from without the circle of rota.- tion, and will force this air or other fluid inwardly at an angle t0 said outerY ends. The impact of the air or other uids meeting from the inner and outer portions of the blades, compresses the air and thereby give resistance pressure greater than ordinary atn'iospheric pressure. It will also be seen, that the forcing of the air outward by the inner portion ot the blades tends to produce a vacuum near the center and thereby reduces the air resistance of any body passing through the air immediately to the rear of the middle portion. It will also be seen, that. byreducing the pitch of the outer one-third, the amount of power required to rotate it is lessened, and the strain upon the blade is reduced.

t will be seen that whenever the pressure upon the blades causes them to bend near the .extremity they will be lengthened and on account of the curve being so great, will continue to perform the functions as afore-v said, and not merely whip the air or other fluids outwardly, as would occur in case of the bending of ordinary straight blades at their extremities.

What is claimed is 1. A propeller comprising a hub and two or more oppositely dis osed blades, each blade having its outer si e convexed slightly in a" transverse direction throughout its length with' its inner face adjacent the hub slightly convexed and with its outer end spoon-shaped and concaved on its inner surface, the inner face of the blade between the concaved and convexed portions being only slightly concaved. Y

2. A propeller comprising a hub and a plurality or" blades each blade being curved gradually outward and at its end directed inwardly with one face slightly conveXed in a transverse direction throughout its lengthl and with its opposite Lt'ace concaved with the greater eoncavity formed at the outer end of the blade so that upon rotation of the blades the {iuid is forced inwardly from the outer ends of the `bladesl and compressed between the .inner and outer ends of the blades. Y

3. A propeller comprising a hub and a plurality of blades, each blade having one side convexed throughout its length and terminating in a. curved extremity, andwvith its opposite side conveXed adjacent the hub and being coucaved gradually from its convexed portion to its outerextremity, with that portion adjacent its conveXed portion disposed upon an inclined plane to the plane of rotation of the propeller With'the inclined portion of one lane disposed opposite to the inclined pane portion-of the other blade.

4. A propeller comprising a hub and blades extending from the hub, each blade being eonvexed on one side and curved at its extremity, the opposite side of the blade adjacent the hub being convexed and gradually concaved from its convexed ortion to the outer end of the blade with t e greater concavity of the blade formed adjacent the ,base of the curved extremity of the blade.

In testimony'whereo I aiiix my signature in presence of two witnesses.

LEON TROXLER. Witnesses:

CHESTER W. BROWN, HYP GARRoT. 

